<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>码云文件记录导航</title>
    <style>
        /*.box{
  position:absolute;
  top:50%;
  left:50%;
  width:500px;
  height:200px;
  }*/
        
        html,
        body {
            height: 100%;
            width: 100%;
        }
        
        .wrapper {
            text-align: center;
            display: flex;
            width: 100%;
            height: 100%;
            min-height: 400px;
            min-width: 800px;
            display: -webkit-flex;
            position: absolute;
            top: 50%;
            left: 50%;
            width: 600px;
            height: 400px;
        }
        
        .wrapper div {
            /*flex: 1;
            -webkit-flex: 1;*/
            margin: 0 8px 0 8px;
        }
        
        .J {
            position: relative;
            /*top: -200px+12.5px;*/
            top: -187.5px;
            left: -305px;
            width: 75px;
            height: 66px;
            border-right: solid 16px#000000;
        }
        
        .J:before {
            position: absolute;
            content: '';
            bottom: -60px;
            right: -16px;
            width: 50px;
            height: 60px;
            border-width: 0 16px 15px 14px;
            border-color: #000000;
            border-style: solid;
            border-radius: 0 0 75%75%;
        }
        
        .J:after {
            transform: rotate(-40deg);
            position: absolute;
            content: '';
            top: 40px;
            left: -20px;
            width: 60px;
            height: 60px;
            background-color: #ffffff;
        }
        
        .U {
            position: relative;
            /*top: 12.5px;*/
            top: -187.5px;
            left: -290px;
            width: 60px;
            height: 80px;
            border-width: 0 16px 0 16px;
            border-color: #000000;
            border-style: solid;
        }
        
        .U:before {
            position: absolute;
            content: '';
            top: 65px;
            left: -16px;
            width: 60px;
            height: 45px;
            border-width: 0 16px 15px 16px;
            border-color: #000000;
            border-style: solid;
            border-radius: 0 0 200%200% /0 0 300%300%;
        }
        
        .N {
            position: relative;
            /*top: 12.5px;*/
            top: -187.5px;
            /*left: 10px;*/
            left: -290px;
            width: 63px;
            height: 125px;
            border-width: 0 15px 0 15px;
            border-color: #000000;
            border-style: solid;
        }
        
        .N:before {
            transform: skew(30deg, 0);
            position: absolute;
            content: '';
            top: 0;
            left: 24px;
            width: 15px;
            height: 125px;
            background-color: #000000;
        }
        
        .footer {
            /*content: 'keep it simple & stupid';*/
            position: absolute;
            bottom: 8px;
            left: 0;
            right: 0;
            font-size: 12px;
            text-align: center;
            margin: 0 auto;
            color: #000;
        }
        
        .footer div {
            font-size: 12px;
        }
    </style>
</head>

<body>
    <div class="main">
        <div class="wrapper">
            <div class="J"></div>
            <div class="U"></div>
            <div class="N"></div>
        </div>
        <!--<div></div>-->
        <div class="footer">
            <div>keep it simple & stupid</div>
        </div>
    </div>
</body>

</html>